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1.
A ballet dance move, meaning 'twirl' in French.

The ballerina is on pointe whilst on of her feet is in passe and she twirls. This move is commonly done in a Pas De Deux choreography.
"She looks so graceful in that pirouette."
by Naleigha September 21, 2013
 
2.
v.: to insert one's penis into another's coffee and then coax them into drinking it; often associated with the Nescafé. (see Nescafé)
Leonard's coffee hinted at a slight dish detergent taste; he had fallen victim to a Pirouette.
by Tom Zappacosta September 23, 2003